US5697649A - Articles employing a magnetic security feature - Google Patents

Articles employing a magnetic security feature Download PDF

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Publication number
US5697649A
US5697649A US08/439,295 US43929595A US5697649A US 5697649 A US5697649 A US 5697649A US 43929595 A US43929595 A US 43929595A US 5697649 A US5697649 A US 5697649A
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United States
Prior art keywords
security
magnetic metal
security feature
thread
soft magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/439,295
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English (en)
Inventor
Andrew Dames
Geraint Davies
Alaric Naiman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crane and Co Inc
Original Assignee
Crane and Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Crane and Co Inc filed Critical Crane and Co Inc
Priority to US08/439,295 priority Critical patent/US5697649A/en
Assigned to CRANE & CO, INC. reassignment CRANE & CO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCIENTIFIC GENERICS LIMITED
Assigned to SCIENTIFIC GENERICS LIMITED reassignment SCIENTIFIC GENERICS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAMES, ANDREW, DAVIES, GERAINT, NAIMAN, ALARIC
Priority to SI9620061A priority patent/SI9620061A/sl
Priority to PCT/US1996/006713 priority patent/WO1996035586A1/en
Priority to AT96915703T priority patent/ATE187687T1/de
Priority to PT96915703T priority patent/PT824405E/pt
Priority to AU57410/96A priority patent/AU5741096A/en
Priority to DE69605662T priority patent/DE69605662T2/de
Priority to DK96915703T priority patent/DK0824405T3/da
Priority to JP8534298A priority patent/JPH10509394A/ja
Priority to EP96915703A priority patent/EP0824405B1/de
Priority to ES96915703T priority patent/ES2141500T3/es
Publication of US5697649A publication Critical patent/US5697649A/en
Application granted granted Critical
Priority to GR20000400628T priority patent/GR3032932T3/el
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/369—Magnetised or magnetisable materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06187—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with magnetically detectable marking
    • G06K19/06196—Constructional details
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S283/00—Printed matter
    • Y10S283/901—Concealed data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12465—All metal or with adjacent metals having magnetic properties, or preformed fiber orientation coordinate with shape

Definitions

  • the present invention relates generally to machine detectable and optionally machine readable and visually verifiable articles for use with security documents that offer unique authenticating properties and an enhanced degree of anti-forgery security. These articles, such as planchettes and security strips or threads, are also suitable for use with means of identification, such as labels.
  • the present invention further relates to security papers employing such an article(s).
  • security documents may be rendered less susceptible to forgery or counterfeiting by including materials in various forms within the body of the document. These materials may be introduced during manufacture and may take the form of a continuous thread or ribbon of polyester, regenerated cellulose, polyvinyl chloride or other plastics film. These materials may also take the form of planchettes of plastic and/or paper.
  • Such anti-forgery devices generally are coated with a layer of metal and/or hard (i.e., permanent) magnetic material. Threads coated with a layer of metal, such as aluminum, may display: positive image characters or indicia as described in U.S. Pat. No.
  • Threads or planchettes coated with a layer of magnetic material may be detected by suitable devices that depend upon intrinsic magnetic properties such as permeability, retentivity, hysterisis loop and coercivity or upon special magnetic properties given to the material such as discontinuities in the magnetic material or coded variations in the magnetization of the material.
  • EP 0 310 707 A2 discloses a thread coated with a magnetic iron oxide bar code. Bars or regions of the bar code can have different thicknesses that result in detectable differences in magnetic intensities. These differences in bar thicknesses are hidden by a masking or paint layer; U.S. Pat. No. 5,196,681 that also teaches a thread coated with a magnetic iron oxide bar code.
  • the bars or regions of the bar code are made up of different ranges of products that result in regions having detectable differences in coercivities. Moreover, these regions also have different thicknesses that result in different detectable magnetic intensities.
  • magnetic materials involve so-called "hard” magnetic materials having high coercivities of greater than 10 kiloamperes/meter. As alluded to above, these materials are detected by their remanent magnetization after exposure to a magnetic field. The magnetic field is applied either at manufacture, or just before detection. Additional materials used in such applications include magnetic powders such as ferrites, and thin sheets or ribbons of crystalline magnetic material, such as nickel. (See, e.g., Column 7, lines 1 to 6 of EP 0 310 707 A2.)
  • Magnetic materials have been used in the field of electronic article surveillance, as well.
  • Article surveillance or identification (ID) systems have developed features that incorporate several discrete magnetic elements with each element giving a different response to an applied interrogation field.
  • the multiplicity of characteristics of the response which is received can be separated by electronic processes (i.e., "decoded") to identify the tag or marker.
  • the separable characteristic can be identified as frequency, magnetic intensity switch-on threshold, or some combination of the two.
  • such uses have not employed extremely thin feature layers or small scale patterning.
  • Magnetic materials used in such applications include "soft" magnetic materials having low coercivities of less than 100 amperes/meter, that can be interrogated from a distance, with a relatively weak magnetic field. These materials are unique and require extremely meticulous control of capital-intensive equipment for their production.
  • Examples of uses of magnetic materials in the field of electronic article surveillance include: U.S. Pat. 4,940,966 that discloses the use of tags or markers that carry a plurality of magnetic elements where such elements either have different ferromagnetic material compositions and thereby have a variety of magnetically nonlinear characteristics, or have several different magnetically soft and/or hard and/or semi-hard elements in proximity to one another (various combinations of these different elements reportedly characterize different objects, and give rise to specific magnetic signatures); and U.S. Pat. No. 4,960,651 that discloses antipilferage tags or markers that employ a thin film of amorphous metal glass.
  • the thin film is claimed as being no greater than 6 microns in thickness, however, thicknesses below 500 nanometers (nm) or 5000 angstroms ( ⁇ ) are disclosed as problematic, if in fact achievable, where "surface pinning effects become dominant and the signal obtained from the tag in an interrogation gate is poor.” (Column 5, lines 1 to 4 of U.S. Pat. No. 4,960,651).
  • the present invention therefore provides an article for use with security documents and means of identification such as labels, which comprises at least one security feature that employs a soft magnetic metal.
  • the present invention provides an article that comprises at least two security features where a first security feature is a machine detectable and optionally machine readable security feature made up of an optionally repeating pattern of soft magnetic metal and where a second security feature is a public security feature comprising magnetic and/or non-magnetic metal formed indicia.
  • the present invention further provides a security paper having an article(s), as defined hereinabove, at least partially embedded therein and/or mounted thereon.
  • FIG. 1 is a schematic perspective view of a preferred embodiment of the present inventive article in the form of a security thread employing a first and a second security feature.
  • FIG. 2 is a schematic perspective view of another preferred embodiment where a first security feature of the present inventive article, again in the form of a thread, has magnetic metal regions of augmented thicknesses so as to provide regions of differing magnetic response.
  • FIG. 3 is a plan view of yet a further preferred embodiment of the present inventive article, in the form of a security thread, where a first security feature and a second security feature are co-extensive features.
  • FIG. 4 is a plan view of the present inventive article, in the form of a planchette or platelet, employing a first and a second security feature.
  • Articles usable in the present invention include articles in the form of threads, planchettes or platelets, and the like.
  • the magnetic metals contemplated by the present invention for use with the security feature or first security feature are soft magnetic metals having low coercivities of less than about 5000 amperes/meter (A/m), when measured by an alternating current magnetometer at frequencies of from about 10 kilohertz (kHz) to about 100 kHz.
  • Preferred soft magnetic metals have coercivities of between about 50 A/m and about 5000 A/m, and more preferably between about 100 A/m and about 2000 A/m.
  • the soft magnetic metals contemplated demonstrate toughness and resilience to mechanical deformation and in addition have a high intrinsic relative permeability of from about 200 to about 100,000, demonstrate saturation at low magnetic fields of below about 10,000 A/m, and have a degree of magnetic non-linearity that is sufficiently high to give measurable harmonic signals during mid-range (i.e., 1 to 2 mm) examination of magnetic properties with an imposed magnetic field.
  • Preferred soft magnetic metals include amorphous metal glass materials such as amorphous alloy soft magnetic metals, including cobalt/iron based alloys, iron/nickel based alloys and cobalt/nickel based alloys.
  • Suitable cobalt/iron based alloys are available from Vacuumschmelze GmbH, Postfach 2253, D-63412, Hanau, Germany under the trade designations: Vacuumschmelze 6025 (66% cobalt (Co), 4% iron (Fe), 2% molybdenum (Mo), 16% silicon (Si) and 12% boron (B)); Vacuumschmelze 6030 (similar to Vacuumschmelze 6025, around 70% Co, minor constituents unknown); and Vacuumschmelze 6006 (46% Co, 26% Ni, 4% Fe, 16% Si and 8% B).
  • Suitable iron/nickel based alloys are available from Allied-Signal, Inc., Parsippany, N.J. 07054 under the trade designations: Allied Metglas 2714 and 2704. Such materials give an amorphous structure under certain deposition conditions.
  • the magnetic metal contemplated for use with the second security feature of the present invention is not restricted and includes both soft and hard magnetic metals.
  • the non-magnetic metals contemplated by the present invention include aluminum, nickel, and silver, with the preferred metal being aluminum.
  • the inventive article 10 basically comprises a plastic substrate 12 having at least one security feature that employs a soft magnetic metal located thereon.
  • the subject drawings depict preferred embodiments of article 10 which comprise a plastic substrate 12 having two security features, where a first security feature 14 comprises an optionally repeating pattern 16 of soft magnetic metal and where a second security feature 18 comprises magnetic and/or non-magnetic metal formed indicia 20.
  • the optionally repeating pattern 16 of the first security feature 14 comprises at least one soft magnetic metal region 22, and at least one partitioning region 24, where such regions are optionally in alternating sequence in pattern 16 which extends along the length of the plastic substrate 12.
  • Partitioning region(s) 24 serves to allow contiguous metal regions 22 to act quasi-independently from each other magnetically when article 10 is subjected to any appropriate data/identification/denomination interrogation scheme. In other words, the detectable characteristics of the partitioning region 24, if any, do not interfere with the detectable difference of the signals generated by contiguous metal regions 22.
  • article 10 is in the form of a security thread and the pattern 16 comprises one magnetic metal region 22 and one partitioning region 24, with both regions adopting a rectangular configuration.
  • the metal formed indicia 20 are located in both the magnetic metal region 22 as magnetic metal formed indicia and in the partitioning region 24 as metal indicia.
  • the pattern 16 of article 10 (also in the form of a security thread), comprises three magnetic metal regions 22 a, b, c, of increasing thicknesses, so as to provide regions of differing magnetic intensities, and three partitioning regions 24 a, b, c, that adopt the configuration of a dollar sign.
  • the metal-formed indicia 20 are located in and between each magnetic metal region 22 a,b,c, of pattern 16.
  • the metal-formed indicia 20 that adopt the configuration of a dollar sign are co-extensive with partitioning regions 24 a, b, c.
  • the term co-extensive, as used herein, is intended to mean that the subject regions and indicia have the same spatial boundaries.
  • FIG. 3 displays yet another more preferred embodiment of the present invention, where the magnetic metal regions 22 of the first security feature 14 and the second security feature 18 are co-extensive.
  • the metal formed indicia 20 of the second security feature 18 are magnetic metal indicia that form the magnetic metal region(s) 22 of the first security feature 14.
  • FIG. 4 displays a planchette in accordance with the present invention where the partitioning regions 24 of the first security feature 14 and the second security feature 18 are co-extensive.
  • the metal formed indicia 20 form the partitioning regions 24 of the first security feature 14.
  • the plastic substrate 12 of the present inventive article 10 may be manufactured from any clear or translucent, and preferably non-magnetic and non-conductive, material.
  • Such materials include polyester, regenerated cellulose, polyvinyl chloride, and other plastic film, with the preferred material being polyester.
  • Such films remain intact during the papermaking process and preferably have a width ranging from about 0.5 millimeters (mm) to about 3.0 mm.
  • the optionally repeating pattern 16 of the first security feature 14 of the present invention comprises at least one soft magnetic metal region 22 and at least one partitioning region 24, optionally in alternating sequence in pattern 16 which extends along the length of the plastic substrate 12.
  • Other contemplated sequences include blocks of a plurality of magnetic metal regions 22, employing various amounts of magnetic metal, separated by partitioning regions 24.
  • partitioning region 24 serves to allow contiguous regions 22 to act quasi-independently from each other magnetically this region 24 may take the form of a magnetic metal-free region or may take the form of a region having reduced magnetic metal cover as compared to contiguous magnetic metal regions 22.
  • the magnetic metal region(s) 22 and the partitioning region(s) 24 can adopt any shape or configuration.
  • each magnetic metal region 22 of the present inventive article 10 have a thickness ranging from about 0.01 to about 10 microns and more preferably have a thickness of from about 0.10 to about 0.50 microns. It is also preferred that each magnetic metal region 22 have a length along the lateral edge of the plastic substrate 12 ranging from about 0.1 mm to about 5 mm.
  • the preferred article 10 having magnetic metal regions 22 adopting the above-referenced dimensions should render relative shape-determined magnetic permeability values in a preferred range of 200 to 10,000. Such high permeability enables the magnetic metal to be saturated easily in weak magnetic fields. Moreover, saturation that occurs at particular fields provide further authentication means.
  • the second security feature 18 can be a separate and/or co-extensive public security feature and comprises magnetic and/or non-magnetic metal formed indicia, such as metal characters or clear characters defined by metal boundaries.
  • magnetic metal formed indicia 20 or clear characters can form a part of each magnetic metal region 22 and partitioning region 24 and/or can form partitioning region(s)
  • magnetic metal indicia 20 or magnetic metal characters can form the magnetic metal region(s) 22 and/or a part of each partitioning region 24, while non-magnetic metal indicia or non-magnetic metal formed indicia 20 can form a part of partitioning region(s) 24.
  • the article 10 is a security thread embedded in a security paper
  • the indicia 20 create a term or phrase that is not readily discernable in reflective illumination, but which becomes legible to the viewing public in transmitted illumination.
  • the first and second security features 14, 18 may be formed by depositing metal on the plastic substrate 12 by any one of a number of methods including, but not limited to, methods involving selective metallization by electrodeposition, directly hot stamping onto the substrate 12 or using a mask or template in a vacuum metallizer, and methods involving metallization followed by selective demetallization by chemical etching, laser ablation and the like.
  • Contemplated metallization or deposition techniques include sputtering, e.g., planar magnetron sputtering, electron beam or thermal evaporation/sublimation, and electrolytic chemical deposition in addition to organometallic vapor pyrolysis.
  • a preferred metallization or deposition technique is sputtering.
  • Sputtering is a physical vapor deposition process that is carried out in a vacuum chamber, in which ions of gas (e.g., argon), are accelerated across a difference in electrical potential with sufficient force to eject atoms from a target.
  • ions of gas e.g., argon
  • the ejected atoms travel through a partial vacuum until they collide with a surface (e.g., plastic substrate) on which they can condense to form a coating.
  • the target used in the preferred sputtering process e.g., an alloy capable of forming an amorphous metal glass
  • the target used in the preferred sputtering process be prepared by plasma spraying from a melt and that the deposited material not be annealed after deposition.
  • Contemplated selective demetallization techniques are techniques where deposited material is selectively removed from a target surface. As set forth above, these techniques include chemical etching and laser ablation etching. Also included are abrasion and lift-off techniques. Lift-off techniques contemplate the selective removal of deposited material by selective adhesive application followed by removal of the adhesive on a carrier. Chemical etching and laser ablation techniques are preferred.
  • Chemical etching can be carried out by selective printing of a resist followed by chemical etching using an appropriate etchant such as ferric chloride or a hydrofluoric acid/nitric acid mix.
  • an appropriate etchant such as ferric chloride or a hydrofluoric acid/nitric acid mix.
  • etching techniques that only partially remove the original thickness of the deposited metal may be employed in conjunction with techniques that serve to etch to the full depth of the deposited metal layer(s).
  • Laser ablation etching can be carried out at reduced laser power, where the soft magnetic metal of the present invention, when heated to temperatures of about 350° to 400° C., crystallizes out of the amorphous state.
  • the resulting morphological disruption typically causes the material to flake and crumble. Accordingly, power requirements are reduced when compared to requirements inherent in the laser etching of vacuum deposited aluminum.
  • thermal contact print heads which achieve temperatures of about 350° C. to about 450° C. and resolutions of up to about 300 dots per inch (dpi), to drive recrystallization of the subject material and thereby effect material removal or etching.
  • the present inventive article 10 may include additional layers or coatings.
  • Contemplated additional layers or coatings include plastic protective outer layers, that serve to render article 10 less susceptible to chemical attacks, and reflective metal layers and camouflage coatings, that serve to render article 10 less apparent under reflective illumination when article 10 is embedded in security papers, such as banknotes. Also included are adhesive layers that facilitate the incorporation of article 10 into or onto security documents.
  • the sheet can be slit into security threads using conventional techniques or divided into a large number of planchettes by a suitable die cutting operation.
  • Article 10 in the form of security threads and/or planchettes may be introduced into security papers, such as banknotes, during the manufacture of such security papers.
  • article 10, in the form of planchettes may be pressed, optionally with the aid of an adhesive,. onto the surface of a partially consolidated paper web, resulting in the surface mounting of such planchettes.
  • Article 10, in the form of a security thread may be incorporated within wet paper fibers while the fibers are unconsolidated and pliable, as taught by U.S. Pat. No. 4,534,398, resulting in the thread 10 being totally embedded in the resulting paper.
  • Article 10 in the form of a thread may also be fed into a cylinder mold papermaking machine, cylinder vat machine, or similar machine of known type, resulting in partial embeddment of thread 10 within the body of the finished paper (i.e., paper with a windowed thread).
  • article 10, in the form of a thread may be mounted on the surface of security papers either during or post manufacture.
  • Detection schemes contemplated for use with the present inventive article 10 include simple recognition/authentication schemes and data/identification/denomination detection schemes. Such dual machine-readable functionality is made possible by the combination of the soft magnetic material and the optionally repeating pattern 16.
  • the use of the soft magnetic material enables simple recognition/authentication by mid-range (i.e., 1 to 2 mm between the detector head and the magnetic feature) examination of magnetic properties with an imposed magnetic field.
  • Optionally repeating pattern 16 enables data/identification/denomination by near-contact magnetic reading of pattern 16 as it passes over a detection head.
  • Detectable magnetic characteristics of the soft magnetic materials of the present invention include permeability, coercivity, B-H (magnetization/demagnetization) loop, non-linearity and magnetization characteristics. One or more of these magnetic characteristics can be measured and compared against standard detection signatures for the purpose of authenticating and identifying or denominating the subject security document.
  • This Example describes a preferred method used to prepare a preferred embodiment of the present inventive article 10 and is not intended to limit the generally broad scope of the present invention.
  • Resist and Etch Method--The prepared METALLIZED FILM or web was fed from a roll to a Mark Andes Flexographic multistation printing press (Model No. 4110). The web was then fed, at a web speed of 21.3 meters/minute, to a print station where it passed between a print roller and an impression roller. A quantity of U.V. RESIST, at ambient temperature, was delivered to the metallized surface of the web, through the print roller, in a pattern as set forth in FIG. 3 and at a rate sufficient to render a dry U.V. RESIST layer thickness of 1.5 microns. The U.V. RESIST layer was then cured under a focused 300 watt U.V. lamp for about 0.43 seconds.
  • the web was then fed, at a web speed of 21.3 meters/minute, to an etching station where it passed through a dip tank (which accommodated 76 centimeters (cm) of web path, and which contained ETCH at a temperature of 74° C.) and picked up a layer of ETCH. Upon exiting the etching station excess ETCH was metered off the web with pinch rollers.
  • the web was then fed through a neutralizing bath of sodium bicarbonate and then through a water bath and then dried with hot air dryers at 77° C.
  • Lamination and Coating--A quantity of a solvent-based adhesive was then applied to the patterned surface of the web at a rate sufficient to render a dry adhesive layer thickness of 4 microns and then the web was dried with hot air dryers at 77° C.
  • a sheet of polyester film, having a thickness of 3.6 microns, was then fed from a roll onto the moving web and the web, with the polyester film overlayment, was passed under a hot nip, having a temperature of 71° C., to effect lamination of the film to the web.
  • the laminated web was then passed through a pigment coating station where a quantity of a TiO 2 -based coating was delivered to the surface of the laminated web at a rate sufficient to render a dry layer thickness of 2 microns.
  • the pigment coated web was then dried with hot air dryers at 77° C. and a quantity of a water-based adhesive was then applied to the web at a rate sufficient to render a dry adhesive layer thickness of 2 microns.
  • the web was then dried with hot air dryers at 77° C. and in a final step, the web was inverted and a layer of a TiO 2 -based coating and a layer of a water-based adhesive were applied, as described hereinabove, to the other surface of the web.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Credit Cards Or The Like (AREA)
  • Burglar Alarm Systems (AREA)
  • Hard Magnetic Materials (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Magnetic Treatment Devices (AREA)
  • Printing Methods (AREA)
  • Paper (AREA)
US08/439,295 1995-05-11 1995-05-11 Articles employing a magnetic security feature Expired - Fee Related US5697649A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US08/439,295 US5697649A (en) 1995-05-11 1995-05-11 Articles employing a magnetic security feature
ES96915703T ES2141500T3 (es) 1995-05-11 1996-05-10 Articulos que utilizan un elemento magnetico de seguridad.
AU57410/96A AU5741096A (en) 1995-05-11 1996-05-10 Articles employing a magnetic security feature
JP8534298A JPH10509394A (ja) 1995-05-11 1996-05-10 磁性安全特性を使用した物品
AT96915703T ATE187687T1 (de) 1995-05-11 1996-05-10 Magnetisches sicherheitselement enthaltende artikel
PT96915703T PT824405E (pt) 1995-05-11 1996-05-10 Artigos empregando marcas magneticas de seguranca
SI9620061A SI9620061A (sl) 1995-05-11 1996-05-10 Predmeti, ki uporabljajo magnetno zaščitno lastnost
DE69605662T DE69605662T2 (de) 1995-05-11 1996-05-10 Magnetisches sicherheitselement enthaltende artikel
DK96915703T DK0824405T3 (da) 1995-05-11 1996-05-10 Artikler med en magnetisk sikkerhedsegenskab
PCT/US1996/006713 WO1996035586A1 (en) 1995-05-11 1996-05-10 Articles employing a magnetic security feature
EP96915703A EP0824405B1 (de) 1995-05-11 1996-05-10 Magnetisches sicherheitselement enthaltende artikel
GR20000400628T GR3032932T3 (en) 1995-05-11 2000-03-10 Articles employing a magnetic security feature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/439,295 US5697649A (en) 1995-05-11 1995-05-11 Articles employing a magnetic security feature

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DK0824405T3 (da) 2000-06-13
ES2141500T3 (es) 2000-03-16
DE69605662D1 (de) 2000-01-20
PT824405E (pt) 2000-05-31
DE69605662T2 (de) 2000-07-13
GR3032932T3 (en) 2000-07-31
WO1996035586A1 (en) 1996-11-14
JPH10509394A (ja) 1998-09-14
EP0824405A1 (de) 1998-02-25
ATE187687T1 (de) 2000-01-15
EP0824405B1 (de) 1999-12-15
SI9620061A (sl) 1998-04-30
AU5741096A (en) 1996-11-29

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